<meta charset="UTF-8">
<meta name="viewport" content="width=device-width">
<title>作业</title>
<h2 align="center">作业</h2>
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<p align="center" >
  <a href="1.html">
    <button style="width:200px;">
      <h3>下拉框</h3>
    </button>
  </a>
</p>

<p align="center" >
  <a href="2.html">
    <button style="width:200px;">
      <h3>100~200之间随机数</h3>
    </button>
  </a>
</p>

<p align="center" >
  <a href="3.html">
    <button style="width:200px;">
      <h3>5张图片自动切换</h3>
    </button>
  </a>
</p>
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